Chris@16: //-----------------------------------------------------------------------------
Chris@16: // boost variant/detail/variant_io.hpp header file
Chris@16: // See http://www.boost.org for updates, documentation, and revision history.
Chris@16: //-----------------------------------------------------------------------------
Chris@16: //
Chris@16: // Copyright (c) 2002-2003
Chris@16: // Eric Friedman, Itay Maman
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See
Chris@16: // accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #ifndef BOOST_VARIANT_DETAIL_VARIANT_IO_HPP
Chris@16: #define BOOST_VARIANT_DETAIL_VARIANT_IO_HPP
Chris@16: 
Chris@16: #include <iosfwd> // for std::basic_ostream forward declare
Chris@16: 
Chris@16: #include "boost/variant/variant_fwd.hpp"
Chris@16: 
Chris@16: #include "boost/detail/templated_streams.hpp"
Chris@16: #include "boost/variant/static_visitor.hpp"
Chris@16: 
Chris@16: namespace boost {
Chris@16: 
Chris@16: ///////////////////////////////////////////////////////////////////////////////
Chris@16: // function template operator<<
Chris@16: //
Chris@16: // Outputs the content of the given variant to the given ostream.
Chris@16: //
Chris@16: 
Chris@16: // forward declare (allows output of embedded variant< variant< ... >, ... >)
Chris@16: template <
Chris@16:       BOOST_TEMPLATED_STREAM_ARGS(E,T)
Chris@16:     BOOST_TEMPLATED_STREAM_COMMA
Chris@16:       BOOST_VARIANT_ENUM_PARAMS(typename U)
Chris@16:     >
Chris@16: inline BOOST_TEMPLATED_STREAM(ostream, E,T)& operator<<(
Chris@16:       BOOST_TEMPLATED_STREAM(ostream, E,T)& out
Chris@16:     , const variant< BOOST_VARIANT_ENUM_PARAMS(U) >& rhs
Chris@16:     );
Chris@16: 
Chris@16: namespace detail { namespace variant {
Chris@16: 
Chris@16: template <typename OStream>
Chris@16: class printer
Chris@16:     : public boost::static_visitor<>
Chris@16: {
Chris@16: private: // representation
Chris@16: 
Chris@16:     OStream& out_;
Chris@16: 
Chris@16: public: // structors
Chris@16: 
Chris@16:     explicit printer(OStream& out)
Chris@16:         : out_( out )
Chris@16:     {
Chris@16:     }
Chris@16: 
Chris@16: public: // visitor interface
Chris@16: 
Chris@16:     template <typename T>
Chris@16:     void operator()(const T& operand) const
Chris@16:     {
Chris@16:         out_ << operand;
Chris@16:     }
Chris@16: 
Chris@16: private:
Chris@16:     printer& operator=(const printer&);
Chris@16: 
Chris@16: };
Chris@16: 
Chris@16: }} // namespace detail::variant
Chris@16: 
Chris@16: template <
Chris@16:       BOOST_TEMPLATED_STREAM_ARGS(E,T)
Chris@16:     BOOST_TEMPLATED_STREAM_COMMA
Chris@16:       BOOST_VARIANT_ENUM_PARAMS(typename U)
Chris@16:     >
Chris@16: inline BOOST_TEMPLATED_STREAM(ostream, E,T)& operator<<(
Chris@16:       BOOST_TEMPLATED_STREAM(ostream, E,T)& out
Chris@16:     , const variant< BOOST_VARIANT_ENUM_PARAMS(U) >& rhs
Chris@16:     )
Chris@16: {
Chris@16:     detail::variant::printer<
Chris@16:           BOOST_TEMPLATED_STREAM(ostream, E,T)
Chris@16:         > visitor(out);
Chris@16: 
Chris@16:     rhs.apply_visitor(visitor);
Chris@16: 
Chris@16:     return out;
Chris@16: }
Chris@16: 
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // BOOST_VARIANT_DETAIL_VARIANT_IO_HPP